2010 Ford Flex, Ecoboost engine, Casita
16 (3,000 lb in typical travel trim, single arm weight
distributing hitch and friction anti-sway bar. You'll need some sort of WDH per Ford towing requirements for anything over 2,000 lb and/or 200 lb tongue weight
The normal V-6 is about 260 hp with the Ecoboost engine about 360 hp.
Over three years (33k miles)I'm averaging about 17.5 mpg. About 10k of that mileage is towing and I'm getting 14-15 mpg towing. 18-19 normal day-to-day.
The Ecoboost engine is a beast. I can flog the 4,600 lb box 0-60 mph in 6.2 seconds when not towing.
I have the factory tow package which include anti-sway software for towing which apparently applies brakes
in side to side pairs when it senses sway but I have the anti-sway bar so I use it.
I'm not exactly a neutral observer but I've towed this trailer with 2 and 4 door Explorers and a couple V8 F150's and the Flex is the best thing yet in my experience.
I don't know how much pep the unaspirated V6 motor would have but I have acceleration to spare while towing so I expect the normal v6 would do just fine.
(revised to correct the sway control description.)